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음이온 교환막 알칼리 수전해를 위한 운전 조건 및 구성요소의 최적화
장명제(Myeong Je Jang),원미소(Mi So Won),이규환(Kyu Hwan Lee),최승목(Sung Mook Choi) 한국표면공학회 2016 한국표면공학회지 Vol.49 No.2
The hydrogen has been recognized as a clean, nonpolluting and unlimited energy source that can solve fossil fuel depletion and environmental pollution problems at the same time. Water electrolysis has been the most attractive technology in a way to produce hydrogen because it does not emit any pollutants compared to other method such as natural gas steam reforming and coal gasification etc. In order to improve efficiency and durability of the water electrolysis, comprehensive studies for highly active and stable electrocatalysts have been performed. The platinum group metal (PGM; Pt, Ru, Pd, Rh, etc.) electrocatalysts indicated a higher activity and stability compared with other transition metals in harsh condition such as acid solution. It is necessary to develop inexpensive non-noble metal catalysts such as transition metal oxides because the PGM catalysts is expensive materials with insufficient it’s reserves. The optimization of operating parameter and the components is also important factor to develop an efficient water electrolysis cell. In this study, we optimized the operating parameter and components such as the type of AEM and density of gas diffusion layer (GDL) and the temperature/concentration of the electrolyte solution for the anion exchange membrane water electrolysis cell (AEMWEC) with the transition metal oxide alloy anode and cathode electrocatalysts. The maximum current density was 345.8 mA/c㎠ with parameter and component optimization.
Mo/Mo-Na 후면전극에 의한 전해증착 CuInSe2 박막으로의 Na 첨가
장명제 ( Myeong Je Jang ),김명한 ( Myung Han Kim ) 충북대학교 산업과학기술연구소 2014 산업과학기술연구 논문집 Vol.28 No.2
Na in CuInSe2(CIS) absorber is well known to improve the solar cell performance. In the present study, Na was added into the electro-deposited CIS absorber with Mo / Mo-Na bilayer back contact, deposited on the Na-free Corning glass. The thickness of Mo-Na layer was varied between 0 and 500 nm. After heat-treating the Mo-Na / Mo / CIS layer at 500 °C for 30 min in Ar atmosphere, the AES depth profile analysis represented that Na was diffused from the Mo-Na layer to Mo layer and then diffused into the CIS layer. The XRD measurements showed the decreased peaks of the preferred orientation(110) of Mo with increasing Na concentration. The peaks of preferred orientation (112) of CIS orientation increased with the increase of Mo-Na layer thickness up to 200 nm, and then decreased as the Mo-Na layer thickness increased. The CIS grains, grown vertically to the Corning glass, showed the columnar dendrites and the grain sizes increased with the increase of Mo-Na layer thickness up to 200 nm. However, beyond that thickness, the CIS grains did not change so much in sizes and grew irregularly, especially at the Mo-Na layer thickness of 500 nm. The results represent that Na concentration in the CIS absorber can be controlled with varying the Mo-Na layer thickness of back contact and the excessive amount of Na in CIS absorber can be detrimental to the photovoltaic property.
음이온 교환막 수전해에 사용되는 Cu0.72Co2.28O4 산소 발생 촉매의 합성 및 특성 분석
박성민,장명제,박유세,정재엽,정재훈,이주영,최민관,노유성,서민호,김형주,양주찬,김양도,최승목 대한금속·재료학회 2020 대한금속·재료학회지 Vol.58 No.1
In this study, we investigated the morphological, crystal structural, electronic structural, and electrocatalytic properties of the inverse spinel structured copper cobalt oxide (Cu0.72Co2.28O4) catalysts. The materials were prepared by coprecipitation using various copper and cobalt precursors, and subsequent oxidation treatment. Electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and Brunauer Emmett Teller (BET) analyses were employed to characterize the Cu0.72Co2.28O4 catalysts. The Cu0.72Co2.28O4 catalyst, synthesized with acetate based precursors, exhibited higher activity for the oxygen evolution reaction than commercial precious IrO2 catalyst. This performance was attributed to its high surface area, sheet morphology and ratio of Co3+. The Cu0.72Co2.28O4 catalyst also showed excellent stability with a performance of 99% after 300 hours. The Cu0.72Co2.28O4 catalyst anode electrode was coupled with a Pt/C cathode electrode to construct an anion exchange membrane water electrolysis (AEMWE) cell. Our AEMWE cell achieved a current density of 644 mA/cm2 and an energy efficiency of 85% at a cell voltage of 1.8 V in 1M KOH.